Freebeginner6 modules · 20 lessons · ~7h

Linux Security Administration

A practical, beginner-friendly course for security professionals who need Linux skills on the job. 20 hands-on lessons covering system hardening, access control, logging, network security, and incident response.

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Course curriculum

Getting Started with LinuxFoundation

L1. What Is Linux and Why Security Pros Use It
L2. Choosing a Distribution: Ubuntu, RHEL, Kali and Beyond
L3. Terminal Essentials: Navigation, Files and Pipes
L4. Installing Software: apt, dnf and Package Managers

Users, Permissions and Access ControlAccess control

L5. Users, Groups and the Root Account
L6. File Permissions: chmod, chown and ACLs
L7. Sudo Configuration and Least Privilege
L8. PAM: How Linux Handles Authentication

System HardeningHardening

L9. SSH Hardening: Keys, Config and Fail2Ban
L10. Firewall Fundamentals: UFW and iptables
L11. Reducing Attack Surface: Services, Ports and Daemons
L12. CIS Benchmarks: A Hardening Checklist

Logging, Monitoring and AuditingVisibility

L13. Syslog and journald: Where Linux Logs Everything
L14. The Audit Framework: Writing auditd Rules
L15. File Integrity Monitoring with AIDE
L16. Centralized Logging: Shipping Logs Off-Box

Network SecurityNetwork

L17. Network Diagnostics: ss, tcpdump and Wireshark Basics
L18. TLS Certificates: Let's Encrypt and Certificate Management

Patching and Incident ResponseOperations

L19. Patch Management: Automated Updates and Rollback
L20. Incident Response on Linux: First Steps When Something Goes Wrong